Device for cutting stone and concrete



Aug. 7, 1956 c. T. ASBURY DEVICE FOR CUTTING STONE AND CONCRETE Y. W 1 RB t W W s e MAJQ e h VT N S N nv .v. 5 a u M R. A. m M7 C 4 w m F Filed April 5, 1954 Aug. 7, 1956 c. T. ASBURY 2,757,659

DEVICE FOR CUTTING STONE AND CONCRETE Filed April 5, 1954 2 Sheets-Sheet 2 INVTOR. CHARLES T. ASBURY BY MwgM ATTORNEYS United States Patent DEVICE FOR CUTTING STONE AND CONCRETE Charles T. Asbury, Fort Laudertlale, Fla.

Application April 5, 1954, Serial No. 421,078

13 Claims. (Cl. 125-15) This invention relates to methods of cutting and devices therefor, and particularly to methods and devices for cutting stone, concrete, and the like.

In my previously filed applications, Serial No. 289,649 filed May 2, 1952, and Serial No. 339,004 filed February 25, 1953, there have been devices illustrated for cutting stone and concrete, particularly characterized in employ ing twisted wire cutting elements supported on a rotary holder, and which cutting elements have proved to be extremely effective and to have long life for the purpose of cutting stone or concrete and for cleaning expansion grooves between slabs of concrete and the like.

The present invention discloses further refinements and arrangements in connection with cutting tools of this nature and methods of operation thereof.

A particular object of the present invention is the provision of an improved cutting tool of the nature referred to which is simple in construction and inexpensive to manufacture.

A further objective of the present invention is the provision of a cutting tool of the nature referred to in which the cutting elements per se can readily be replaced at any time and at a minimum of expense.

A still further object of the present invention is the provision of a cutting tool utilizing twisted wire cutting elements in which the cutting elements are movably supported on the holder therefor thereby having, in part,

the characteristics of the hammers of a hammer mill in of two or more cutting elements of different characv, teristics whereby an improved cutting action is obtained.

Still another object of the present invention is the provision of an improved holder means for the cutting tool of the nature referred to, by means of which they can be attached to a driven support therefor.

provision of a cutting tool utilizing substantially fiat strip material beveled to present a leading forward cutting edge and formed to fit within the arcuate pockets of the pivoted holder therefore thereby having, in part,

the characteristics of the hammers of a hammer mill in operation.

These and other objects and advantages of this invention will become more apparent upon reference to the following specification, taken in connection with the ice Figure 5 is a perspective view showing the holder for the twisted wire cutting elements in Figure 2;

Figure 6 is a sectional view indicated by line 66 on Figure 2 showing the use of a shoulder screw for supporting the holder on the support in Figure 2 so that the holder is movable on the support;

Figure 7 is a perspective view showing a cutting device as in Figure 1, but utilizing holders for the twisted wire cutting elements according to Figures 2 and 5;

Figure 8 is a perspective View showing a cutting device similar to what is illustrated in Figure 1, but wherein the driven support has pulley means integral therewith;

Figure 9 shows a modified construction of a cutting device wherein a blade is employed having a cutting edge integral therewith at one end and supporting a twisted wire cutting element at the other end;

Figure 10 shows a modified form of cutting element; and

Figure 11 is a cross section on line 11-11 of Figure 10.

Referring to the drawings somewhat in more detail, Figure 1 shows a support plate 10 apertured at 12 for being mounted on a shaft and driven in rotation in the plane of the said plate. Plate 10, at each end, has connected thereto a holder 14 by a bolt 16 with the holder holding a generally V-shaped twisted wire cutting element 18 having its ends projecting outwardly from the ends of the plate. When plate 10 is driven in rotation at suitable speed and brought into engagement with stone or concrete the twisted wire cutting elements 18 will rapidly and effectively cut the material which they engage forming a substantially smooth-sided slot therein. Lubricant can be employed if desired, but due to the spaced arrangement of the twisted wire cutting elements and the small amount of contact between the cutting elements and the material being cut the provision of a lubricant or a cooling medium is not essential in most cases.

In Figures 3 and 4 it will be noted that the holder 14 comprises a flat back part 20 engaging the surface of plate 10, with its opposite side edges rolled up as at 22 and 24 to form arcuate pockets or recesses to receive the legs of the twisted wire cutting element 18. Adjacent the portion 22 there is a turned-up tab 26 that confines the cutting element within the pocket formed by portion 22.

Mounted on top of the fiat back part 20 of holder 14, and retained thereon by bolt 16, is a clip 28 having a portion bent up therefrom as at 30 in Figure 4, and

. also with a tab 32 bent out from the turned-up portion A still further object of the present invention is the and overlying the closed end of the twisted wire cutting element 18.

The portion 20 of holder 14 may comprise a tab 34 turned up so as to lie beneath extending portion 32 of clip 28, and may also comprise a stop tab at 36 spaced inwardly from the recesses or pockets formed by turnedup portion 24 of the holder.

The described arrangement of holder 14 makes it possible to positively retain a cutting element in the holder while still making it a simple matter to remove the twisted wire cutting element from the holder should it be necessary to replace the cutting element. The twisted wire cutting element is retained positively within the holder because the direction of rotation of the holder,

as it is viewed in Figure 3, is toward the left and the tab 26 prevents the lefthand leg of the cutting element from being dislodged from the pocket formed by turnedup portion 22, whereas the righthand leg of cutting element 18 is, of course, merely pressed into its supporting pocket by the load imposed on the cutting element.

In order to remove the cutting element from the holder it is only necessary to press the legs together as illustrated by the dot-dash line 38 in Figure 3, which will then permit the cutting elements to be removed from the vicinity of the pocket formed by turned-up portion 22 by rotating the cutting element about its lefthand leg. The cutting element is then removed from the holder by withdrawing the lefthand leg from the pocket formed by turned-up portion 22 and tab 26.

The arrangement shown in Figure 2 comprises a rotatable support 40 having attached to one side thereof a fiat metallic cutting and clearing element 42, and to the other side thereof a holder 44 having therein a twisted wire cutting element 46, the holder 44 being retained on support 40 by bolt 48.

As will be seen in Figure 5, the holder 44 comprises a rear tab 50 which lies in face to face engagement with support 40 and a front tab 52 which is formed with the groove 54 therein in which the twisted wire cutting element 46 is located. According to Figures 2 and 5 the holder must be removed from support 40 in order to replace the twisted wire cutting element 46, but it will be understood that the holder itself can be re-used as many times as desired.

In connection with any of the cutting and clearing elements illustrated in Figures 1 and 2, the attached bolt which holds it to the support may advantageously take the form of a shoulder screw as illustrated at 56 in Figure 6, and which shoulder screw engages the support 58 in such a manner that the holder 60, or the cutting element which is attached to the support by the screw, is free to pivot on the holder and thus to be subject to centrifugal forces during operation to hold it into extended position similar to the hammer of a hammer mill. This type of support for the cutting elements permits them to yield backwardly when overloaded and, also, for a cutting tool of a predetermined size and operating at a predetermined velocity, the cutting elements would actually act as hammers in that they would be swinging forwardly on the support at the time they were brought into engagement with the material to be cut, thereby enhancing the cutting action.

The cutting tool illustrated in Figure 7 will be seen to consist of a support a corresponding to support 10 in Figure l, with twisted wire cutting elements 460 held on the support by holders 44a corresponding to the holder 44 in Figure 2.

In Figure 8 there is shown a support 60 having integral therewith, or fixedly secured thereto as by bolt 62, the pulley means 64, by means of which the support is driven in rotation. In Figure 8 the twisted wire cutting elements 18a are supported by holders 144 which correspond in construction to the holders illustrated in Figure 1.

In Figure 9 there is shown a cutting tool consisting of a support plate 70 adapted for being driven by shaft 72 on which it is mounted, and having at one end thereof a holder 14b on which is mounted the twisted wire cutting element 18!); the said holder and cutting element being constructed as in Figure l. The end of plate 70 opposite the twisted wire cutting element comprises a cutting edge 74 for cooperation with the twisted wire cutting element, either as an additional cutting element or as a clearing member to clear the groove or slot being cut by the twisted wire cutting element.

The plate 70 in Figure 9 may also advantageously comprise the outwardly formed portions 76 which causes the plate to develop a fan action as it rotates thereby tending to blow dust created by the cutting operation away from the tool, thus improving the visibility of the operator and also relieving the atmosphere in the immediate vicinity of the fine dust.

From the foregoing it will be perceived that the present invention deals with an improved cutting tool for stone and concrete, and the like, characterized in the provision of one or more twisted wire cutting elements which may be arranged in combination of flat plating or clearing elements, together with pivotal support of the twisted wire cutting elements and novel holder means therefor, facilitating replacement of the twisted wire cutting elements and greatly reducing the cost of manufacture and the cost of maintenance of the cutting tool.

Figure 10 shows a cutting element in the form of a fiat strip mounted in a holder according to Figure l. The element of Figure 10 is preferably hardened and has its outer edge 82 beveled to provide a cutting edge. The cutting element can be reversed in the holder to permit both sharpened edges to be used.

it will be understood that this invention is susceptible to modification in order to adapt it to different usages and conditions, and, accordingly, it is desired to comprehend such modifications within this invention as may fall within the scope of the appended claims.

I claim:

1. In a cutter of the nature described; a rotary support, a generally V-shaped twisted wire cutting element having its legs extending outwardly from said support and its closed end overlapping said support, and a holder secured to said support and detachably engaging the closed end of said cutting element for holding it on said support, said holder comprising a fiat plate having aper ture means formed thereon at one side to receive one leg of the cutting element by endwise insertion therein and pocket means formed on the other side to embrace the outside of the other leg.

2. In a cutter of the nature described; a rotary support, a generally V-shaped twisted wire cutting element having its legs extending outwardly from said support and its closed end overlapping said support, and a holder secured to said support and detachably engaging the closed end of said cutting element for holding it on said support, said holder comprising a flat plate having aperture means formed thereon at one side to receive one leg of the cutting element by endwise insertion therein and pocket means formed on the other side to embrace the outside of the other leg, said aperture means being on the leading side of the holder as the support rotates during a cutting operation, and said pocket means permitting manual release of the cutting element from the holder by pressing the legs of the cutting element together, turning the cutting element about the said one leg thereof, and withdrawing the cutting element from the aperture means.

3. In a cutter of the nature described; a rotary support, a generally V-shaped twisted wire cutting element having its legs extending outwardly from said support and its closed end overlapping said support, and a holder secured to said support and detachably engaging the closed end of said cutting element for holding it on said support, said holder comprising a flat plate having aper ture means formed thereon at one side to receive one leg of the cutting element by endwise insertion therein and pocket means formed on the other side to embrace the outside of the other leg, there being stop means on the plate inside the closed end of the cutting element to prevent outward movement of the cutting element on the holder.

4. In a cutter of the nature described; a rotary support, a generally V-shaped twisted wire cutting element having its legs extending outwardly from said support and its closed end overlapping said support, a holder secured to said support and detachably engaging the closed end of said cutting element for holding it on said support, said holder comprising a fiat plate having aperture means formed thereon at one side to receive one leg of the cutting element by endwise insertion therein and pocket means formed on the other side to embrace the outside of the other leg, there being stop means on the plate inside the closed end of the cutting element to prevent outward movement of the cutting element on the holder, a shoulder screw pivotally connecting the holder to the support, and a retainer clip having one end under the screw and its other end extending over the .closed end of the cutting element.

5. In a cutter of the nature described; a rotary support, a generally V-shaped twisted wire cutting element having its legs extending outwardly from said support and its closed end overlapping said support, a holder secured to said support and detachably engaging the closed end of said cutting element for holding it on said support, said holder comprising a fiat plate having aperture means formed thereon to receive one leg of the cutting element and having an edge turned up embracing the outside of the other leg and a portion of the closed end of the cutting element and also overlying the top of a part of said other leg, and stop means on the plate engaging the inside of the closed end of the cutting element whereby the resilience of said cutting element retains it on said holder.

6. In a cutter of the nature described; a rotary support, a generally V-shaped twisted wire cutting element having its legs extending outwardly from said support and its closed end overlapping said support, a holder secured to said support and detachably engaging the closed end of said cutting element for holding it on said support, said holder comprising a plate folded over on the closed end of said cutting element with the end of the plate adjacent the support being flat and the other end being formed with indentations to receive said cutting element, and means located between the legs of the cutting element securing the holder to the support and holding the two ends of the plate together.

7. In a cutter of the nature described; a rotary support, a generally V-shaped twisted wire cutting element having its legs extending outwardly from said support and its closed end overlapping said support, a holder secured to said support and detachably engaging the closed end of said cutting element for holding it on said support, said holder comprising a plate folded over on the closed end of said cutting element with the end of the plate adjacent the support being flat and the other end being formed with indentations to receive said cutting element, and means located between the legs of the cutting element securing the holder to the support and holding the two ends of the plate together, said means comprising a shoulder screw pivotally connecting the holder to the support.

8. In a cutter of the nature described; a rotary support, a generally V-shaped twisted wire cutting element having its legs extending outwardly from said support and its closed end overlapping said support, a holder secured to said support and detachably engaging the closed end of said cutting element for holding it on said support, said holder comprising a plate folded over on the closed end of said cutting element with the end of the plate adjacent the support being fiat and the other end being formedwith indentations to receive said cutting element, and means located between the legs of the cutting element securing the holder to the support and holding the two ends of the plate together, the fold in said plate being between the legs of said cutting element.

9. In a cutter of the nature described; a support, a twisted wire cutting element attached to said support, said cutting element being generally V-shaped and having .its leg portions projecting outwardly from the periphery of said support, and a fiat metallic blade also secured to said support in the same plane as said cutting element, said support being adapted for being driven in rotation to drive said cutting element and flat blade into cutting relationship with a member to be'cut.

10. In a cutter of the nature described; a support, a generally V-shaped twisted wire cutting element secured to said support with the leg portions projecting outwardly from said support, said support taking the form of a plate, said plate having a portion substantially co-planar with said cutting element and about the same radial distance outwardly from the center of rotation of said support to serve as a flat bladed element cooperating with said twisted Wire cutting element.

11. In a cutter of the nature described; a support, a generally V-shaped twisted wire cutting element secured to said support with the leg portions projecting outwardly from said support, said support taking the form of a plate, said plate having a portion substantially co-planar with said cutting element and about the same radial distance outwardly from the center of rotation of said support to serve as a flat bladed element cooperating with said twisted wire cutting element, said support having offset portions therein between the center of rotation and the periphery providing a fan action as said support is rotated.

12. In a cutter of the nature described; a rotary support, a relatively stiff generally V-shaped cutting element having its legs extending outwardly from said support and its closed end overlapping said support, and a holder secured to said support defining opposed arcuate pockets for detachably engaging the outer surfaces of the closed end of said cutting element and holding it on said support, and means on said holder whereby said cutting element is removed therefrom by pressing the legs together, rotating one of said legs clear of said holder and withdrawing the element from said holder.

13. In a cutter of the nature described; a rotary support, a relatively stiff generally V-shaped fiat cutting element having its legs extending outwardly from said support and its closed end overlapping said support, a holder comprising a flat plate secured to said support and having opposed side edges rolled outwardly from said support to define recesses for receiving the legs of said cutting element adjacent the closed end thereof, and means on said holder whereby the cutting element is released from the holder by pressing the legs of the element together, rotating the cutting element to clear one of the legs of said recess and withdrawing the element from said recesses.

References Cited in the file of this patent UNITED STATES PATENTS 128,290 Dimes June 25, 1872 134,582 Beiderhase et al. Jan. 7, 1873 661,650 Thurston Nov. 13, 1900 1,493,670 Galvin May 13, 1924 1,970,302 Gerhardt Aug. 14, 1934 2,480,877 Peterson Sept. 6, 1949 

